bio_kmalloc related fixes for 5.12

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Subject: bio_kmalloc related fixes for 5.12
From: Christoph Hellwig <hch@xxxxxx>
Date: Wed, 24 Feb 2021 08:24:03 +0100
Cc: Jens Axboe <axboe@xxxxxxxxx>, Satya Tangirala <satyat@xxxxxxxxxx>, Chaitanya Kulkarni <Chaitanya.Kulkarni@xxxxxxx>, John Stultz <john.stultz@xxxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx

Hi Jens,

a few fixes for 5.12 below.

Follow-Ups:
- Re: bio_kmalloc related fixes for 5.12
  - From: Jens Axboe
- [PATCH 4/4] block: memory allocations in bounce_clone_bio must not fail
  - From: Christoph Hellwig
- [PATCH 3/4] block: remove the gfp_mask argument to bounce_clone_bio
  - From: Christoph Hellwig
- [PATCH 2/4] block: fix bounce_clone_bio for passthrough bios
  - From: Christoph Hellwig
- [PATCH 1/4] block-crypto-fallback: use a bio_set for splitting bios
  - From: Christoph Hellwig